(1) This subchapter, RCW 26.26A.300 through 26.26A.355, governs genetic testing of an individual in a proceeding to adjudicate parentage, whether the individual:

(a) Voluntarily submits to testing; or

(b) Is tested under an order of the court or a child support agency.

(2) Genetic testing may not be used:

(a) To challenge the parentage of an individual who is a parent under RCW 26.26A.600 through 26.26A.635 and 26.26A.700 through 26.26A.785; or

(b) To establish the parentage of an individual who is a donor.